I think the whole "school kid" look has less creepy connotations in Japan. Most, if not all female characters are very sexualised, but in a "cute" way. The Manga/Anime culture thing has taken off in western countries the past five years or so, mostly dressing up as super-heros etc, though there's a lot of comics/animated series that centre around Japanese school girls with super powers or something.. for some reason. Anyway, it's a very common "look" at not as seedy as it seems.
Also there's Hentai, but I'll let you google that.